Flap-valve for two-cylinder compressors.



g-1w 1 @WQQM R..E. BECHTOLD.

FLAP VALVE FOR TWO CYLINDER COMPRESSORS.

APPLICATION FILED JUNE 2.191s

1;;2'?6A7 Patented Aug. 20, 19%

' j INVENTOR.

W 1 TN ESSES:

A TTO ill PATEN -REUBEN E. BECHTGLD, Oil? FORT-WAYNE, INDIANA, ASSIC-NORTO THE GUARDIAN FRZGERATUR COMPANY, DETROIT, MICHIGAN, A CORPORATION OEMICHIGAN.

FLAP-VALVE FOB TWO-CYLINDER COMPBESSORS.

Specification of Letters Patent.

Application filed June 2, 1916. Serial No. 101,309.

1 all whom it may concern:

- Be it lznownthatll, REUBEN E. BEGHTOLD, a citizen ot'the UnitedStates, residing at Fort lVayne, in the county of Allen and State ofIndiana, have invented new and useful Improvements in Flap-Valves forTwo-Cylinder Compressors, of which the following is a specification.

lcly invention relates to improvements in compressors. and particularlyto flap valves for compressors and pumps.

The purpose of my invention is to provide a valve suitable for use onehigh-speed two-cylinder compressor adapted for use on cooling ap iaratus and the like. It is cheap, etiicient and durable.

My invention is illustrated in the accompanying drawings, in whichFigure 1 is a top plan view of the cyl inder head of a. two-cylindercompressor valve stop with one of its cap screws removed and theunderlying valve shown in dotted lines, in so far as it does notcoincide with the outline of the stop. The valve ports and seats areindicated by dotted lines.

Fig. 2 is an axial section on the line e=m of Fig. 1 through the portsand valve seat, valve and valve stop.

Fig. 3 is the same as Fig. 2, but the valve stop is shown raised insteadof bolted down with the valve in position for service.

in the drawin s 0, C are the cylinders bored in the casting c. Thecylinder heads are formed from a casting A with ports a, a for thecylinders, C, C, respectively. The cylinder head casting is secured tothe cylinder casting by bolts a The circular valve seats, a a are solocated as to be covered by opposite ends of the llap valve V which is aresilient plate held securely in position at or near the middle by avalve stop, when so held 'h end of theplate is avalve held against itswith an initial tension. The cylinder head casting between the valveseats is sl '1' higher than. said seats, and is made in 1e form of a.ridge, a, somewhat raised along the center. The valve stop is grooved tthe center, (Z, to clamp the valve V down :lv upon the said ridge (1*,seating the nil of the flap valve upon the valve seats a and The valvestop D is held securely in position ar the cap screws, (Z threaded intothe cv 'nder head casting A.

The lent plate V which forms the flap valves is not given a permanentset by being clamped upon the ridge by the valve stop, but is therebybent so as to give it an initial tension and cause it toseat'upon. thevalve seats e a and close the ports a, al until temporarily lifted bypressure from within the cylinders, C, G, respectively. The valve stopis so curved on the surfaces'cl (5 above the ports a, a, respectively,as to prevent motion of the valve beyond its limits of elasticity andthis curve is designed to distribute the bending and subject the valvesto the least strain. As the plate which forms the .valves is not piercedor given permanent set, but consists of a single flat piece, it retainsits shape at the free ends so as to hold the valves with auniforminitial pressure over the entire valve seats.

All valves will be uniform and standard, and thus facilitate assembling;and such valves when in use will not require attention, which is animportant point in cooling apparatus of this class. Obviously thisdouble valve can be very cheaply made, and very readily assembled.

I claim as my invention and desire to secure by Letters Patent of theUnited States:

1. A valve for compressors, comprising a valve seat, a sheet of materialconstituting a flap valve for said seat. a support for said sheetelevated above the seat and means for bending the sheet over its supportand into engagementwith the valve seat to bear upon the valve seat withinitial tension.

2. In a compressor. the combination or" two cylinders with. a commonhead provided with a port and valve seat for each cylinder and with aridge substantially midway between the valve seats, a normally fiatelongated resilient strip seated upon the ridge and extending" over bothvalve seats, a valve stop with a groove on its under side which is thecomplement of the ridge and in cooperation with said ridge serves tobend, without setting, the ends of the strip do'u 'nwardly to bear witha tension on the valve seats. the under side of said, stop plate towardboth ends curving in such a. manner as to keep the motion of the valveswithin their limit of elasticity and to equalins and minimize the strainon the valves when in use, and means for holding the stop in clampedposition.

3. In combination with a two cylinder Patented lin 22%)

